#app{
  background-color: rgb(240, 240, 240);
  width: 220px;
  margin: 50px auto;
}
.cin_item{
  height: 50px;
  width: 200px;
  margin-top: 5px;
  margin-left: 5px;
  font-size: 30px;
}
.content{
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}
.content .item{
  width: 35px;

  background-color: rgba(238, 232, 232, 0.986);
  border: 1px solid;
  margin: 5px 4.5px 2px 1px;
  text-align: center;
}